Merge pull request #890 from JustinAiken/feature/remove_def_serializer

Remove unused method `def_serializer`

Author: joaomdmoura

test/test_helper.rb

@@ -36,7 +36,3 @@ def setup
     @routes = TestHelper::Routes
   end
 end
-
-def def_serializer(&block)
-  Class.new(ActiveModel::Serializer, &block)
-end